![]() The first seven tests are the simplest and are required for any sudoku. We go back because we want the least hard solve route. Many of the strategies have knock-on effects which means that they can't be run back-to-back - it'sĮssential that we return to the basic steps. Reason for this step is to make it easier to spot what's changed. Is changed in any way it will go back to the start and "Check for Solved Cells". Productive and the solver will often loop between them. Once theseĪre displayed Take Step will step through other testsĪnd then loop until it can go no further. These are the numbers that do not contradict any known or solved cells. Take Step first displays the possibles or candidates for each The current list contains an example puzzle Reload it again (even if you close your browser - you must allow cookie for this to work).Īpplies only to the example puzzles in the list. Save will remember the current state of the board so you can Use New to empty the board before entering your own puzzle. Try this on any Sudoku to check if it has a unique solution. ![]() Computers are good at this and we now have a new yellow buttonĬalled "Solution Count". The only way to check this is to perform a brute force analysis which tests every possible ThereĪre no logical tricks the solver can use to detect this other than not complete correctly. Many people have written to me to comment about multiple solutions for a given Sudoku. Michael from Denmark has sent me the 'Unsolvable' - a great puzzle from a Sudoku magazine which I can't logically solve yet While one strategy has been picked out as the example many of the others will be required toġ2 clue tough is from " Taking Sudoku Seriously" by Jason Rosenhouse & Laura Taalman published by Oxford University Press, Inc. Some examples start at the beginning of the puzzles, some half way through. Swapped around to no detriment but I have ordered them in what I subjectively believe to be an Their use - unless perhaps one reorders the strategies. They areĪll 'necessary' examples in the sense that no easier strategy will by-pass the requirement for The examples in the list above illustrate some of the many strategies available. Version history here Original version 1.42 12th Jan 2008 There have been a number of miner fixes to the solver in February and March not worthy of a version increment. Added a special kind of Sudoku X Pointng Pair previously found by Simple Colouring. Restored Unique Rectangles to the Sudoku X solver. Cookies also retain the difference between clues and solved cells as well. Should you loose the page it will restore The solver now automatically saves the board every time it changes. You still have a manual save and reload but I have redesigned the way cookies are stored and puzzles loaded. On the small board for number entry I have added an option that automatically clears off candidates as numbers are added.Īlso, changes to the small board are automatically saved. Longstanding feature now implemented.Īdded a clue+solved cell count added a show bi-value cells checkbox. If more than one chain is found the solver will provide buttons to cycle through them. New in version 2.10 (October 8th 2023)Īdded chain cycling. Many thanks to all the people who have done so and helped improve this solver. There is a newįEEDBACK form with a column displaying comments and questions. I am now working independently on puzzle creation.Īll feedback, comments, arguments, bug reports and strategy ideas are welcome. Please check this stratgy guide if you want to use the advanced strategies. There are pitfalls, for example, with Unique Rectangles, which rely on a certain formations. All the normal rules and logical posibilities apply to Sudoku X with Solver they are checked before rows, columns and boxes. For tough puzzles and above the diagonals must be checked. You will want to scan them in case you see an easy 'single'. However, the extra constraints mean that the puzzle creator can leave less clues than normal sudoku.įor the easier Sudoku X puzzles you won't really find a necessary example of a deduction based on the diagonals although You can look along the diagonals (marked with a darked X on th board) and makeĭeductions. To eliminate and find solutions to cells. These extra constraints allow you the puzzle solver to dervice new conclusions about candidates The difference is that in Sudoku X the two diagonals are known to contain You discover the logical solutions for this puzzle. Sudoku X is a great variant of normal Sudoku and this solver is an extension of my Sudoku Solver to help
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